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status, MCM has committed to submitting results of the monitoring program at <br />least semi - annually. <br />The longwall panel of Mine 6 was proposed to undermine the oil pipeline. The <br />predicted subsidence that could occur under this zone was estimated at 10.5 feet, <br />since this would involve one longwall panel under room - and - pillar workings. In <br />lieu of subsiding the pipeline, the operator opted to relocate the pipeline and not <br />conduct full extraction of the coal within 100 feet horizontally of the pipeline. This <br />100 -foot buffer will allow for an angle of draw calculated at 19 °. This plan was in <br />agreement with the Amoco Pipeline Company and approved by the Division by <br />Minor Revision No. 24. <br />The operator also submitted a plan to undermine a portion of the railroad spur, the <br />Williams Fork alluvial valley floor, the Williams Fork River, and a portion of State <br />Highway 13. Further detail on this proposal can be located in Technical Revision <br />No. 19. The Division approved of only development mining under these resources, <br />with three additional subsidence monitoring locations along the highway. <br />1. The Division has previously found the permittee's subsidence control plan <br />complies with Rule 2.05.6(6) and the permittee has committed to adopt all <br />measures in order to reduce the likelihood of subsidence, prevent material <br />damage, and mitigate the effects. The Division has previously approved the <br />plan (4.20.1(2) and 4.20.3(1)). <br />2. The Division has previously found that the permittee's subsidence monitoring <br />program complies with Rule 2.05.6(6)(c), and is designed to determine the <br />commencement and magnitude of subsidence movements. The "E" Seam <br />Longwall Subsidence Monitors map submitted with the semi -annual <br />subsidence report depicts the location of monuments installed and structures <br />monitored within the permit and adjacent area. The results of the monitoring <br />program will be submitted to the Division semi - annually. The monitoring <br />program is designed to extend for a time, beyond cessation of mining in any <br />area, consistent with the need for verification of the subsidence prediction. <br />XL Operations on Alluvial Valley Floors <br />The applicant has determined that alluvial valley floors exist along both the Yampa and <br />the Williams Fork valleys within the permit and adjacent area. This determination is <br />based upon the fact that flood - irrigated agricultural activities are practiced on <br />unconsolidated streamlaid deposits along both rivers. The Division concurs with this <br />determination. The boundary of the alluvial valley floors is shown on Map 25 of the <br />permit application. Three alluvial valley floors have been identified; the Williams Fork <br />alluvial valley floor, the Yampa River/Big Bottom alluvial valley floor, and the Yampa <br />River /Round Bottom alluvial valley floor. <br />Alluvial Valley Floor Exemption <br />Williams Fork Mines 36 Permit Renewal 06 <br />C- 1981 -044 December 8, 2014 <br />